But concerns still remain on aspects of the guarantee, including that the emissions reduction target for the electricity sector is too low, and that large user reliability obligations will require companies have a degree of energy market expertise they don't currently have.

Vince Duffy, an executive director of energy in the South Australian government, also suggested the ESB drop a three year notice period from its eight-step reliability guarantee process and replace it with permanent reliability obligations for retailers.

He said it would simplify the process substantially.

State and federal energy ministers will meet to discuss the guarantee on August 10.